Consolidated Statements Of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Consolidated Statements Of Comprehensive Income (Loss) [Abstract]
Net income	$ 6,978	$ 7,427	$ 12,545	$ 17,778
Other comprehensive income (loss):
Foreign currency translation adjustment (net of tax)	337	420	(12,543)	(10,875)
Derivative financial instruments adjustment (net of tax benefit)	236	1,523	(304)	1,276
Amortization of prior service costs and net gains or losses (net of tax)	2,441	1,556	7,066	4,818
Other comprehensive income (loss)	3,014	3,499	(5,781)	(4,781)
Comprehensive income	$ 9,992	$ 10,926	$ 6,764	$ 12,997